This adorable dessert will satisfy late-night chocolate cravings, and is a great last-minute dessert to put together for guests. Adding coconut oil to the chocolate helps give it a shiny finish (if you don't mind the flavor of coconut, feel free to use unrefined coconut oil instead). We like the combination of dark chocolate and peanut butter, but milk or white chocolate will work as well. For the best-tasting bite, you’ll want your chocolate layers to be thinner than the peanut butter layer (so that the chocolate shatters and releases the creamy peanut butter interior). To get it right, pour just enough chocolate into each cup so that the bottom is just barely covered.